PRINCETON -
SON-1010 is a proprietary version of recombinant human interleukin-12 (rhIL-12), configured using Sonnet's Fully Human Albumin Binding (FHAB) platform, which extends the half-life and activity of the IL-12 component due to binding native albumin in the serum and targets the tumor microenvironment (TME) by strongly binding gp60 and Secreted Protein Acidic and Rich in Cysteine (SPARC). SB101 is a Phase 1 multiple-ascending dose (MAD) trial in adult patients with advanced solid tumors (NCT05352750) that commenced in Q2 2022 and is currently enrolling the sixth dose cohort. SB221 is a Phase 1b/2a dose-escalation and proof-of-concept study of the combination of SON-1010 with atezolizumab (in collaboration with
Safety in both of the active cancer trials has been reviewed by their respective Safety Review Committees at each step during dose escalation. Both trials use a 'desensitizing' first dose to take advantage of the known tachyphylaxis with rhIL-12, which minimizes toxicity and allows higher maintenance doses. No dose-limiting toxicities or related serious adverse events have occurred to date. The safety and toxicity profile that has developed is typical for a Phase 1 oncology trial, with the majority of adverse events (AEs) being reported as mild. All have been transient, with no evidence of cytokine release syndrome. Of the 25 cancer patients dosed to date and evaluable for follow-up at this latest cutoff, 15 (60%) had stable disease at their first follow-up scan, 8 of whom were progressing at study entry. At four months follow-up, 8 of 23 evaluable patients remained stable at the second CT scan, suggesting clinical benefit of SON-1010 in 35% of the patients.
'We have now dosed 18 cancer patients at increasing SON-1010 drug levels in the SB101 study, completed dosing in 31 healthy volunteers in SB102, and are rapidly filling the dose-escalation cohorts with 12 subjects enrolled in the first four cohorts of the SB221 combination study,' said
One patient with progressive endometrial sarcoma receiving SON-1010 monotherapy in SB101 had stable disease (SD) for almost 2 years before progressing - her ascites had resolved and tumors had shrunk at one point but she never reached a partial response (PR) by Response Evaluation Criteria in Solid Tumors (RECIST) rules. Cytokine analysis following each dose in that study revealed controlled and prolonged induction of interferon gamma (IFN?) that peaked at 24 to 48 hours and returned to baseline within 2 to 4 weeks. A small increase in IL-10 was observed with each dose as expected in response to IFN?. There was either a minimal or no signal for IL-1?, IL-6, IL-8, and TNF?, and there was no indication of any potential for cytokine release syndrome (CRS) at these doses. One patient in Part 1 of SB221 with uterine sarcomas received 8 cycles of the SON-1010/atezolizumab combination therapy every 3 weeks before progressing; another two have received 8 and 10 cycles, respectively, and are continuing on the study. The stable AE profiles despite dose escalation led us to reevaluate the target dose, so the Company has added groups in both studies to evaluate 1200 ng/kg SON-1010 as a maintenance dose (the molar equivalent of 800 ng/kg rhIL-12). Finally, Part 2 of the SB221 combination study has been trimmed to remove the monotherapy arm.
'The findings to date in these two trials represent significant progress for the SON-1010 molecule', said
'We are very pleased with the data we are seeing at these higher dose levels of SON-1010, with safety and tolerability being well within expected levels, as well as displaying SON-1010 extended PK/PD, tumor targeting, and clinical activity during treatment,' said
About SON-1010
SON-1010 is a candidate immunotherapeutic recombinant drug that links unmodified single-chain human IL-12 with the albumin-binding domain of the single-chain antibody fragment A10m3. This was selected to bind both at normal pH, as well as at the acidic pH typically found in the TME. The FHAB technology targets tumor and lymphatic tissue, providing a mechanism for dose sparing and an opportunity to improve the safety and efficacy profile of not only IL-12, but a variety of potent immunomodulators that can be added using the platform. Interleukin-12 can orchestrate a robust immune response to many cancers and pathogens. Given the types of proteins induced in the TME, such as the Secreted Protein and Rich in Cysteine (SPARC) and glycoprotein 60 (GP60), several types of cancer such as non-small cell lung cancer, melanoma, head and neck cancer, sarcoma, and some gynecological cancers are particularly relevant for this approach. SON-1010 is designed to deliver IL-12 to local tumor tissue, turning 'cold' tumors 'hot' by stimulating IFN?, which activates innate and adaptive immune cell responses and increases the production of Programed Death Ligand 1 (PD-L1) on tumor cells.
About the SB101 Phase 1 Trial
This first-in-human study is primarily designed to evaluate the safety of multiple ascending doses of SON-1010 in cancer patients and will be conducted at several sites across
About the SB221 Phase 1b/2a Trial
SB221 is a global Phase 1b/2a multicenter, dose-escalation and randomized proof-of-concept study to assess the safety, tolerability, PK, PD, and efficacy of SON-1010 administered subcutaneously (SC), either alone or in combination with atezolizumab given intravenously (IV). The study is designed in Part 1 to rapidly establish the maximum tolerated dose (MTD) of the combination in patients with advanced solid tumors at the lower dose levels. The focus shifts to PROC at higher dose levels using small dose-escalation groups with expansion of the dataset at the recommended Phase 2 dose (RP2D). This would be followed in Part 2 by an assessment in patients with PROC of the potential for improved efficacy of the combination versus the standard of care. Both companies look forward to this collaboration as an opportunity to improve outcomes for patients with ovarian cancer.
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